Anti-Tapasin

Tapasin (UniProt: Q9R233; also known as TPN, TPSN, TAP-associated protein, TAP-binding protein) is encoded by the Tapbp (also known as Tapa) gene (Gene ID: 21356) in the murine species. Tapasin is a single-pass type I membrane glycoprotein protein that is involved in the association of MHC class I with transporter associated with antigen processing (TAP) and in the assembly of MHC class I with peptide. It is synthesized with a signal peptide of 23 amino acids, which is subsequently cleaved to generate mature Tapasin. It assists in loading of antigenic peptides on to class I molecules in the endoplasmic reticulum (ER). It is also reported to support the binding of high-affinity peptides to MHC class I in conjunction with ERp57. Defects in Tapasin expression are linked to destabilization of the MHC class I loading complex and diminution in the expression of MHC molecules at the cell surface. Tapasin is reportedly down-regulated in several human carcinomas and its re-expression in Tapasin-deficient cancer cells restores the expression of MHC class I antigen complexes and augment cancer cell immunogenicity, which helps in longer survival in animals bearing metastatic tumors. (Ref.: Lou, Y et al. (2008). Clin Cancer Res. 14(5); 1494-1501).

This rabbit polyclonal antibody detects Tapasin in murine cells. It targets an epitope within 20 amino acids from the C-terminal region.

Epitope: C-terminus

KLH-conjugated linear peptide corresponding to 20 amino acids from the C-terminal region of murine Tapasin.

Anti-Tapasin Antibody, Cat. No. ABF1067, is a rabbit polyclonal antibody that detects Tapasin in murine cells and has been tested for use in Immunoprecipitation and Western Blotting.

Immunoprecipitation Analysis: A representative lot detected Tapasin in K42 cells (Lum, R., et. al. (2016). J Biol Chem. 291(37):19631-41) and L-cells and BW5147 thymoma cells (Suh, W.K., et. al. (1999). J Immunol. 162(3):1530-40).

Western Blotting Analysis: A representative lot detected Tapasin in CMT.64 cells treated with IFN- (Lou, Y., et. al. (2008). Clin Cancer Res. 14(5):1494-501).

Research Category
Inflammation & Immunology

Evaluated by Western Blotting in NIH/3T3 cell lysate.

Western Blotting Analysis: A 1:1,000 dilution of this antibody detected Tapasin in 10 µg of NIH/3T3 cell lysate.

~51 kDa observed; 49.74 kDa calculated. Uncharacterized bands may be observed in some lysate(s).

Unpurified

Format: Unpurified

Rabbit polyclonal antiserum with 0.05% sodium azide.

Stable for 1 year at -20°C from date of receipt.

Handling Recommendations: Upon receipt and prior to removing the cap, centrifuge the vial and gently mix the solution. Aliquot into microcentrifuge tubes and store at -20°C. Avoid repeated freeze/thaw cycles, which may damage IgG and affect product performance.

Concentration: Please refer to lot specific datasheet.

Unless otherwise stated in our catalog or other company documentation accompanying the product(s), our products are intended for research use only and are not to be used for any other purpose, which includes but is not limited to, unauthorized commercial uses, in vitro diagnostic uses, ex vivo or in vivo therapeutic uses or any type of consumption or application to humans or animals.